My child's teeth are not growing, what could be wrong?

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Dear Doctor,

I have a question about my child’s teeth and the delay in them erupting. My daughter is ten months old and she has not yet grown the two lower teeth unlike her age mates. I usually see kids as young as seven months old with the lower two teeth. Her brother, my first born son, started growing teeth at six months. What do you think is taking her that long yet she has even started walking without and she crawled when she was around five months old? Anxious Mom